Logo novices may be hesitant to write procedures that should be stored in memory and invoked with a single command. The leap from immediate mode doodling to preplanned, hierarchically structured procedure writing can be a large one. It is possible to bridge those two experiences with a simple Logo tool called APPEND.
Harris, J. (1988). Subprocedure anti-APPENDectomies. Logo Exchange, 7(4), 10-12.